I bought a used protein skimmer and it’s been running like this for a whole week. Non stop overflowing. It’s a bubble magus curve 5. It’s properly leveled and I tried every nob adjustments.
1. (if the water level is properly adjusted) let the skimmer skim out all of the bubbles. You just gotta empty the cup a few times until you reach the sweet spot. Anymore than that could be real skimmer issue.
2. Try to find something to put under the skimmer to act as a platform to raise the skimmer height vs water level. Just to make sure that the water level in the sump is not too high. Then wait a bit and see.
When I make the skimmer water level adjustment. I would turn it on a few seconds and see where the highest point of the water level within the skimmer's chamber is. And will try to higher/lower it to the neck. I hope this makes sense :)
Anyone have any better suggestion please chime in.
PS. my apologies you already know this. But when you turn off the main pump for feeding/maintenance it will naturally raise the water level in the sump and always cause this overflow thing.